What kinds of questions are "science questions"?
http://wiki.answers.com/Q/Which_types_of_questions_can_be_answered_by_scientific_methods

NOAA Guide to Scientific Questions
http://www.science-house.org/nesdis/gulf/guide.html

Jeffrey Bloom's taxonomy of "Types of Questions and Inquiry" (this is NOT the "Bloom's Taxonomy" that you are thinking it is)
http://elsci.coe.nau.edu/readarticle.php?article_id=110